Phenotyping the brain, the face, and their genetic interaction over development

The development of the brain and the face is intimately coordinated through a continuous physical and molecular interaction during morphogenesis. Understanding how dynamic spatio-temporal regulation of gene expression patterns guide this process is crucial to reveal mechanisms that may have contributed to human evolution

Імуногістохімічне виявлення судинного епітеліального ростового фактору в корі великих півкуль головного мозку при порушеннях кровообігу

Порушення кровопостачання мозку – одне з актуальних питань сучасної медицини, що обумовлено, як тяжкістю наслідків кожного конкретного випадку хвороби, так і рівнем показників захворюваності, що сягають пандемії, а смертність від цієї патології становить понад 20% і займає друге місце після серцево-судинних захворювань. Сьогодні зміни при ішемії мозку розглядаються як складний багатовекторний процес зі специфічною кінетикою на перебіг якого можна впливати, а не як одноманітну подію, як вважалось ще 20 років тому

Challenges and advances in optical 3D mesoscale imaging

Optical mesoscale imaging is a rapidly developing field that allows the visualisation of larger samples than is possible with standard light microscopy, and fills a gap between cell and organism resolution. It spans from advanced fluorescence imaging of micrometric cell clusters to centimetre-size complete organisms. However, with larger volume specimens, new problems arise. Imaging deeper into tissues at high resolution poses challenges ranging from optical distortions to shadowing from opaque structures. This manuscript discusses the latest developments in mesoscale imaging and highlights limitations, namely labelling, clearing, absorption, scattering, and also sample handling. We then focus on approaches that seek to turn mesoscale imaging into a more quantitative technique, analogous to quantitative tomography in medical imaging, highlighting a future role for digital and physical phantoms as well as artificial intelligence

pMHC affinity controls duration of CD8+ T cell&-DCinteractions and imprints timing of effector differentiationversus expansion

During adaptive immune responses, CD8+ T cells with low TCR affinities are released early into the circulation before high-affinityclones become dominant at later time points. How functional avidity maturation is orchestrated in lymphoid tissue andhow low-affinity cells contribute to host protection remains unclear. In this study, we used intravital imaging of reactive lymphnodes (LNs) to show that T cells rapidly attached to dendritic cells irrespective of TCR affinity, whereas one day later, theduration of these stable interactions ceased progressively with lowering peptide major histocompatibility complex (pMHC)affinity. This correlated inversely BATF (basic leucine zipper transcription factor, ATF-like) and IRF4 (interferon-regulatedfactor 4) induction and timing of effector differentiation, as low affinity&-primed T cells acquired cytotoxic activity earlierthan high affinity&-primed ones. After activation, low-affinity effector CD8+ T cells accumulated at efferent lymphatic vesselsfor egress, whereas high affinity&-stimulated CD8+ T cells moved to interfollicular regions in a CXCR3-dependent manner forsustained pMHC stimulation and prolonged expansion. The early release of low-affinity effector T cells led to rapid target cellelimination outside reactive LNs. Our data provide a model for affinity-dependent spatiotemporal orchestration of CD8+ T cellactivation inside LNs leading to functional avidity maturation and uncover a role for low-affinity effector T cells during earlymicrobial containment.This work was supported by a Novartis Research grant (to A.J. Ozga) and Swiss National Science Foundation grants (31003A_135649 and CR23I3_156234 to J.V. Stein and CRS II3_141918 to J.V. Stein and J. Sharpe). J. Ripoll acknowledges support from European Commission FP7 Career Integration Grants (HIGH-THROUGHPUT TOMO), European Commission FP7 Marie Curie Actions (grant 2PM), and the Ministerio de Economía y Competitividad (grant FIS2013-41802-R). J. Sharpe acknowledges support from the Ministerio de Economía y Competitividad, Centro de Excelencia Severo Ochoa 2013–2017 (grant SEV-2012-0208)

The Role of Spatially Controlled Cell Proliferation in Limb Bud Morphogenesis

Oriented cell behaviors likely have a more important role in limb bud elongation during development than previously suggested by the “growth-based morphogenesis” hypothesis

Are octopus really aliens? On the fine anatomical and histological details of one of the most intriguing sea creatures

19th International European Light Microscopy Initiative Meeting, 4-7 June 2019.-- 1 page, figure

Compensatory Cell Movements Confer Robustness to Mechanical Deformatio during Embryonic Developmentn

Embryonic development must proceed despite both internal molecular fluctuations and external perturbations. However, mechanisms that provide robustness to mechanical perturbation remain largely uncharacterized. Here, we use light-sheet microscopy, comprehensive single-cell tracking, and targeted cell ablation to study the response of Caenorhabditis elegans embryos to external compression. Compression changes the relative positions of many cells and causes severe distortions of the embryonic axes. A large-scale movement of cells then corrects this distortion. Only a few specific cells are required for these compensatory movements, and one cell, ABarppap, appears to generate force, dramatically changing as it moves to its correct local cellular environment. During these movements, we also observed "egressions", cells moving out onto the surface, and lineages that undergo both ingression and egression. In total, our work describes how the embryo responds to a major mechanical deformation that can occur during the early development in situ and puts forward a model to explain how the response is coordinated.publisher: Elsevier articletitle: Compensatory Cell Movements Confer Robustness to Mechanical Deformation during Embryonic Development journaltitle: Cell Systems articlelink: http://dx.doi.org/10.1016/j.cels.2016.07.005 content_type: article copyright: © 2016 Elsevier Inc.status: publishe